Switch handle



R. A.NORLING.

SWITCH HANDLE.

APPLICATION FILED MAv2.192o.

Patented Nov, 7, 1922.

2 SHLELSKSHEET l.

- [zvno/ 1' y @ew @AK 0am/ R. A. NORLING.

SWITCH HANDLE.

APPLICATION man M AY28,1920.

Patented Nov. 7, 1922.

2 SHEETS-SHEE' 2.

K .mi .WK Q\ N f s..." 4,3". S m S m .ww n@ @X Nm l 9..... a if .mwN QN RN @W i, LLIyTOl-S, .A SSLGNOR TO INDEPENDENT PNEU- ELLNUS, CORPORATION OF DELAWARE.

nains-ioni) a. nonnina, or "fr, einlesen,

SWITCH HANDLE.

.application filed May 28,

'0 ZZ vof/wm. it lmuy concorre `lnindle constructed in accorda-nce with my invention and shown attached to the outer casing' oic a portable electrically operated tool. the switch handle and casing` at the point of attachment boina shown in section to illustrate the manner in which the casing and handle contacts engage;

Figs. 2 and 3 are cross-sectional views taken on lines 2-#2 and Smil, respectively, me Fig. l;

Fig: flis a longitudinal sectional View ot the switch handle and showing the switch contacts separated or open and thc actuating); trigg'e f in the position it occupies at that time;

Fis'. 5 is a .cross-sectioinil View taken. on line 5 5 of' Fig. 4l;

Fic'. 6 is a longitudinal section-al View of the switch handle and showing' the switch contacts in engagement and the actuating trif :for in the position it occupies and is held in at such time:

Fifi. 7 is a longitudinal sectional View taken on line 7 7 oft Fia'. a;

Fin'. 8 is a cross-sectional view t: liuc 8--8 oi" iig f I i Finis. f) and l0 are' cross-sectional views i alien ou lince` Sim-9 and l(l--l0.respectivelyE o t Figiu 7:

Fin'. ll is a cross-sectional View taken on lino .ll-ll ot Fig. 4; and

Fig. l2 is a cross-sectional View taken on line ot Figi. (l. i

ln the draw'. l. .indicates the outer cesinf; of a portable elec" allyonerat-edtool., such as a drill. haitiI ,i boss 2, at one side and to which my iinproyed switch handle il .tachabli: secured., the handle extending; cui wardlr from on side ot the tool casing.

usual in tools ol; this Oeneral type.

lien on Ouates. residing at` 1920. Serial No. 384,812.

handle 3 comprises two parts, a switch casing;` i at the inner end land a tubular handle stem 5 at the opposite end. The switch casnig` a has an `end flange 6 :it `its inner end `and a tubular extension 7 at its other end.

The Bange G is detachably secured to the hossQ by' fastening` members. `such as screws 8, thus permitting|` the switch handle to be readily removed troni and attached to the tool. The switch casing l has an openii'ig vin one of its walls, and this openingis closed by a vremovable cover plate 9, thus enabling' access to bek had into the switch casino; Afor inspection or repair.

The handle stem 5 has an enlarged porf ion l0 at its inner end to receive the extension 7 of the switch casing. The portion l0 is split longitudinally for a short distance inward and lugs or ears ll are provided on opposite sides of the line off severance to be vengaged by a screw l2 to clamp the handle stern on the extension 7 and to removably connect such parts together. Thefscrew 'l2 also engages an annular groove 13 in the extension 7, so that by loosening' the screw the handle stein 5 may be turned about its longitudinal axis roi' bringing' the actuat- .ing` trigger of the switch mechanism int-o convcnent position for grasping and. holding during` the operation of the tool. Thus the position oit the trigger may be readily changed by turning the handle stern without turning the tool from its working position'. The inner end oit the switch casing` Il; is closed by a disc or plate llt of insulating material. as fiber. and held in place by screws l5. Attached to the inner surface of this disc are spring` contact iringers 16. 17. arranged in pairs. with the lingers oit each pair oppositely disposed. shown in Figs. 4. (i, and 7. The lingers of each pair are prevented from contactinsr witr'l. each other by an interposed ber or other insulating bushingr .i8 on a rod 19 extending across and secured in the switch casing, as shown in Fig?. 7. The Fingers of each pair are provided atvtheir free ends with opposed contact blocks 20. `The disc 1 4- is provided. with two contacts 2l, haring substantially flat contact surfaces and which surfacesv are substantially flush with the outer tace ot the fastening; flange 6. The handle contacts ill, 52E?. do not project beyond the end ot` the handle and therefore are not likely to be damaged by exterior obj ects when the handl@ by a binding screw 24E, and to these are` attached the respective current conductors 25, 25 contained in a cable 26 leading into the switch casing l at one side thereof, as shown in Figs. 1, it, and`6. The cable is secured to the switch casing by a saddle clamp 27 fastened to the casing by screws 28, thus taking the strain oit' the binding 'screws 2li. vTo prevent the cable from kinking at the switch casing and protect it from injury by contact with the handle parts. the

cable is wrapped by a coil oi vire 29, tightly wound and directing and yieldably holding theJ cable away from the switch handle.

The boss 2 of the tool is closed by a disc 30 of insulating material secured to the tool casing by screws 3l, as shown in ii, This disc carries two contact members 32, 32, these being at the outer ends of screws 33, which are surrounded by coil springs 34 providing yielding supports for said contacts. The contact surfaces of these ccntacts 32 are substantially hat and engage the handle contacts 21, 22 when the handle is attached to the tool. Conductor wires 35 are connected with the casing contacts 32, 32 and lead to the motor (not shown) in the tool. The conductor wires 25, being connected to separate and distinct sets of conta-cts, carried by the tool casing and handle respectively, permits ready disconnection of the handle from the tool casing without disturbing the connection of the wires with their respective contacts. Moreover, the casing contacts 32, 32 being yieldably mounted causes them to bear constantly against the handle contacts 2l, 22 when the handle is secured to the tool casing.

Slida-bly mounted in the extension 7 is a sleeve 36 open at its outer end and closed at its inner end by a head 37. This has a peripheral slot 33 engaged by a guide block 39, held fixed by a screw 40. This block holds the sleeve 36 against rotation. rlhe shoulder at the end of the extension 7 limits the endwise4 movement of the sleeve 36 in that direction, while an inwardly projecting vlug fil limits the movement ot the sleeve in the opposite direction. The head 37 has two extensions 42, 4t2 projecting toward the spring lingers 16, 17A and one 1to1" each pair ot fingers. 0n each extension 4.2 a blade 43 secured thereto by screws 44. Each blade projects beyond its extensions and is there provided with contact blocks 5, on opposite sides ot the blade and adapted to more between and in engagement with the contact blocks 20 on the associated pair ot fin-` insane() there is one set for the positive side of the Acircuit and a separate set for vthe negative side, and by cutting both positive and negative sides, when the switch is thrown out, a short circuit would not be produced even though the contact-iingers ot' onev set were bridged while the switch is oil'.

To provide a quick snap make and break between the contacts of the switch. mechanism and thus avoid destructive arcing, the following construction is provided.v in the handle stem 5 is secured a trigger block 46 slotted longitudinally and into which extends the inner end oi the actuatingv trigger Li7 pivoted in the block by a pin 43. lhe trigoer projects out from the handle through an elongated slot i9 therein. Said block is held against rotative as well as endwise movement by a key 50. (See Figs. 6 and l2.) The outer end of the stein 5 is open to permit the switch actuating parts to be inserted into the same, the open end of the stein being removably closed by atubular shaped coverl or cap 5l, which also overlaps the key 50 and holds it in place. in the stem 5 beyond the block 46 is an expansion spring 52 connected by a yoke 52a to the trigger 47 to normally throw and hold it into position with the switch coi'itacts separated or apart, as shown in `Figs. 4- and 7. This is the normal position of the parts. The opposite end of the block 46 has a tubular extension 53, in which is slidably mounted one end of a rod 54. rllhe other end of the rod extends through the head 37 of the sleeve 36 and is secured thereto by slotted discs 55, 56 engaging grooves in that end of the rod and on opposite sides of the head. The outer disc is held in place by acotter pin 57, as shown in F 7. A portion of the rod 54 in the extension 53 is reduced to provide a. substantially wide groove forming at its ends shoulders 58 facing each other, while the rod toward the sleeve 36 is enlarged, as at 59, the .latter providing at its ends oppositely facing-shoulders 60, 6i. Capable oit a short, end movement on the rod 54 toward and away from said shoulders (it), 6l are annular collars 62, 63, between which extends a contractile coiled spring 611:, one ond secinftal to one collar and the other end secured to the other collar, the spring surrounding said enlar-ged portion 59, as shown in Figs, 4land 6.

Surrounding the spring 64e is a sleeve having a length shorter than the distance between the collars 32, and in the path of movement ci said collars. Fixed to the sleeve 65 and extending towarlgl the nigger Afl-7 is a har GG. This has sliding bearing in a groove (S7 in the extension as shown in Fig. S. Said'bar ('56 is connected by a link 68 with the trigger 1-7, shown. lSaid bar 66 is cut away between its ends to provide oppositely inclined cam. iaces G9, 70, which in the endwise movement ot said bar engage and actuate a pawl 71 located in a transverse recess 72 in the trigger' blocl; Alo, as shown in Figs. (5, 7, and 1t). rl`his pawl, which is arcuate in shape as shown in Fig. 10, is pivot-ed to the bloclc by a pin 73. The pawl 71 has swinging movement at right angles to the rod 5a, and a spring 74- (Fig. 10) serves to normally hold the pawl in the path of the cam `surfaces (Si), 70. To co-operate with these surfaces, the tree end ot the pawl has converging inclined surfaces 75, 7G. When the switch contacts are engaged, as shown in Fig. 6. the body olf the pawl extends across the end ot rod 54; to hold it in that position, while when the switch contacts are separa-ted, as shown in Fig, et, the pawl extends into the groove between the shoulders 5S and holds the rod in that position. The action olz the cams (59, 7 O on the pawl swings it clear ot the rod to release it. and permits the action oit the spring GJCl in a manner to be presently described.

The structure shown and described oper ates as follows: Then the parts occupy the positions shown. in Fig, l, the switch contacts 1G, 17 and 43 are sejarated or open and no current tlows to the motor of the tool when the switch., handle secured thereto. the trigger -lT at this time being in its normal position, that is. directed toward the outer end ot the handle stem and in position to be grasped by the hand ot the operator and swung toward the inner end oit the handle tor moving the switch contacts into engagement and cutting in the current to the motor ot the tool. The trigger is held in normal position by the spring 52 and the spring 64 holds the switch contacts apart or open. The rod -t is held against accidental endwise mo ven'ient by the pawl 71 engaging the shoulders while the collars 62, (SI-i are hcld against the shoulders (30, 61 by said contractile spring (il. To move the switch contacts into engagen'ient tor cutting in the current to the motor ot the tool, the trigger 4-.7 is `engaged by the thumb or hand ot the ori'icrator and swung toward the inner end ot the handle. As the trigger is being swung in this direction, the bar 66 is moved in the saine direction and the sleeve is ..arried therewith. As said sleeve moves inward. it pl'lshes the collar (32 inward on the rod :3f-l, which is held stationary by the pawl 7'1.. and expands or stretches the spring 64, due to the tact that the other collar 63 is held stationary against the shoulder 61 on the rod This operation stores up power in the spring G4, and as soon as the cam on the bar 6G acts on the pawl 71, the latter is swung outward and releases the rod 54. and permits the spring 6l to impart a quick snap movement to the rod and move the contact blades 43 carried thereby into engagement with the contact lingers 16, 17 and cut in current to the motor ot the tool. Movement Qt the rod in this direction is arrested by contact ot the head 37 with the stop lug 41 on the guide block 39, as shown in Fig. 6, and thus the rod contacts are prevented 'rom. moving beyond the fixed contact men'ibers 16, 17. The spring acts constantly to return the trigger i7 to its normal or starting position, as shown in Figs. land 7, and consequently the operator must retain his hand on the trigger and p hold it in position with the switch contacts engaged, in order to supply the motor ofthe tool. with current; otherwise, as soon as the trigger is released, it will be returnedto its starting position and cause the switch contacts to be separated and the current to the tool cut ott. This is an advantageous 'teature as it provides a safety device and cuts out the switch the moment the trigger is released, thus stopping the motor of the tool and preventing it trom injury and damage being done when the tool is not to be used. As the trigger moves to normal position, the har 66 is pulled with it, but no movement is imparted to the rod -l the pawl 71 extending across the outer end ot' the rod holds it stationary. The sleeve 65 is moved, however, away :trom the collar 62 and into contactwith the other collar 63. When this happens, a continued movement ot' the sleeve G5 moves the collar 63 away 'trom the shoulder 61 and expands or stretches the spring Gil, whereupon the other collar 62 is brought into engagement with its shoulder 60 and a continued expansion ot the spring 6 4. stores up power in the spring and exerts a pressure on the rod 54 to move it toward the trigger 47. (lust before the trigger reaches its starting position, the cam 69 engages the pawl 71 and swings it away from the rod permitting` the spring 6a to impart a quick movement thereto and break the switch contacts by a quick snap action and thus reduce arcing to the minimum.

To render impossible ari-,ing across the tixed contacts 16, 17 and to protect them trom such arcing as might occur, l place between them a sheet or layer 77 ot asbestos or equivalent material and also linethe walls ot the switch casing -l with like layers 78, 78.

As shown in Fig. 8, the blades are insu'lated 'from the extensions 4-2 and screws le and the clamp plates 79 by interposed layers ot insulatingl material.

The construction described and shown has many advantages, among which are the iollowing. il quick malte and break between the switch contacts provided for, and this .is accomplished by storing up powerin the spring (la before the actuating trigger t7 reaches its final position in either direction.

rthe handle and are connected withthe respective handle contacts 21, 22, while the wires to the motor1 of the tool are connected with the respective casing contacts 32, 32, and as the casing and handle contacts have surface engagement, the switch handle may be removed from and attached to the tool casing without disturbing the conductor wires attached to said contacts or being required to connect and disconnect these wires from their contacts upon removing the handle from or attaching the same to the tool casing'. The switch handle being detachably connected with the tool casing permits the handle to be made and assembled as a unit separate and distinct from the tool and be handled as such during the n'ianufacture and repair thereof. The switch is either fully opened or hilly closed, so that there is no possibility of the switch contacts reinaining in arcing position, and further the positive and negative contacts being broken simultaneously, the possibility of short-circuiting through the handle contactsis prevented, as neither the negative nor positive side of the ci cuit is left closed whenthe switch is open. The switch being automatically cut out as soon as the trigger is released provides an automatically operating device, and provides a safety feature in that the motor of the tool will stop and prevent damage to its partsor to objects with which it may be brought in contact when the tool is not held in position for use. rThis also effects a saving in electric current, as the tool will stop without the operator being required to turn ofi the switch. rThe wire coil 29 being tightly wound holds the cable 26 away from the handle and prevents it from interfering with the actuation. Other and further advan-.

of the trigger. tages will appear to those skilled in the art to which my invention relates.

lhile l have described and shown in detail herein a switch handle of my invention, it is to be of coiu'se understood that the details of construction and arrangement of parts may be variously changed and modified without departing from the spirit and scope of my invention.

I claim as my invention:

l. The combination with a. portable electrically opehated tool having a casing provided with positive and negative contacts, of a switch handle adapted 'to be detachably connected with said tool casing and provided with positive and negative contacts to en.

gage the casing contacts upon attaching the LLA-34,560

handle to the tool casing, electricy coniiluctors attached to respective contacts and carried by the tool casing and handle, respectively, to permit the handle to be removed from and attached to the tool casing without disconnecting the conductors from the contacts, and a switch mechanism carried by said handle for making and breaking the circuit through both the positive and the negative handle and casing' contacts.

2. The combination with a portable electrically operated tool having a casing provided with positive and negative contacts, of a switch handle adapted to be detachably connected with the tool casing and having positive and negative contacts to enga-ge the casing contacts upon attaching the handle to the tool casing, one set of positive and negative contacts being yieldably mounted and both sets having substantially flat contacting surfaces, electric conductors attached to respective contacts and carried by the tool casing and handle, respectively, to permit the handle to be removed from and attached to the tool casing without disconnecting the conductors from the contacts, and a switch nechanisin carried by said handle for malring and breaking the circuit through both the positive and the negative handle and casing contacts.

3. rI he combination with a portable electrically operated tool having a casing provided with an attaching boss at one side thereof, of a disc secured in said boss, a set of positive and negative contacts yieldably carried by said disc and having their contact surfaces substantially fiat and on the outside of said disc, a. switch handle adapted to be detachal'ily connected at its inner end to said boss, a disc secured in the inner end of said handle, a set of positive and negative contacts carried by said handle disc and having substantially flat contact surfaces to engage .the casing' contacts uponattaching the handle to said boss, electric conductors attached to the respective contacts and carried by the tool casing and handle, respectively, to permit the handle to be removed from and attached to the tool casing without disconnecting the conductors from said contacts, and a switch mechanism carried by said handle for making and breaking the circuit through said casing and handle contacts. Y

al.. The combination with a portable electrically operated tool, of a, switch handle comprising a switch casing and a stein, the former adapted to be secured to the tool cas` ing, a switch mechanism in said switch casing, a trigger in the stem, means connecting the switch casing and stem together in a manner permitting the stein to be turned with respect to the switch casing for bringing the trigger in convenient position for grasping and holding during the operation ,of the tool, and means in the stem and rotainserer tive therewith for connecting the switch mechanism and the trigger together.

5. The combination with a. portable electrically operated tool, ot a switch handle comprising a switch asi-ng and a stem, the former adapted to be secured to the tool casing, a switch mechanism in the switch casing, a trigger in the stem, said switch casing having a tubular extension engaged by the inner end ot the stem, the inner end oisaid stem being split longitudinally and provided with opposed ears, a fastening member engaging said ears for clamping the stem on said extension and the latter having an annular groove engaged by said taste/ning member permitting the. stem to be turned about said extension, and means in the stem 'for connecting the switch mechanism and the trigger together.

6. A switch handle, comprising a switch' casing having positive and negative contacts, a switch mechanism in said switch casing and having two pairs ot spring contact iingers, one iinger ofV each pair being connected with the associated handle contacts, current conductors leading into the switch casing and connected with the other contact lingers, switch blades, one for each pair ot contact fingers and adapted to be moved simultaneously into and out of' bridging engagement therewith, said handle having a stem connected with the switch casing, a trigger in said stem, and means connecting the blades and the trigger together for moving the blades into and out of contact with the contact fingers upon actuation ot the trigger.

7. A switch handle, comprising a switch casing and a stem, iixed contacts in the switch casing at the inner end oit the handle, contact members movable into and out ot engagement with the iixed contact members, a pivotally mounted trigger in the stem adjacent the torn/'ard end of the handle, and means connecting the movable contact members with the trigger, including mechanism located in. the stem between the trigger and the movable contact members 'for storing up power during a part oi the movement oi? the trigger and capable oit being released at the end oi? 'the movement oit the triggmt to impart a. quick snap mow-minut to the movable contact members.

S. A switch handle, comprising a switch casing and a. stem, :fixed contacts in the switch casing, contact members movable into and out ot engagement with the fixed contact members, a pivotally mounted trigger in the stem, means connecting the movable contact members with the trigger, including mechanism located in the stem between the trigger and the movable contact members for storing up power during apart ot the movement of the trigger and capable ot being released at the end ot the movement ol" the trigger to impart a quick snap movement to the movable contact members, and means for automatically returning the trigger to its normal position after being released. i

l). A switch handle, comprising a switch casing and a stem, iixed contact members in said switch casing, an endwise movable rod in said stem, contact members carried by said rod and movable therewith into and out ot engagement with said lixed Contact niembers, a pivotally mounted trigger in said stem, means tor holding said rod against endwise movement during a part ot the movement ot said trigger and releasing the rod at the end of the movement ot said trigger, and means connecting said rod with said trigger including a spring surroiuiding said. rod and acting thereon to impart a quick endwise movement to said rod when the latter is released at the end ot the movement ot said trigger.

l0. A switch handle, comprising a switch casing and a stem, fixed contact members in said switch casing, an endwise movable rod in said stem, contact members carried by said rod and movable therewith into and out of engagement with. said fixed contact menibers, a pivotally mounted trigger in said stem, a contractile spring surrounding said rod and acting thereon for imparting endwise movement to said rod, means for holding said rod against movement during a part ot the movement ci; said trigger and releasing said rod at the end of the movement of said trigger, and means movable by said trigger for expanding said spring for moving said rod when released.

ll. A switch handle, comprising a switch casing and a stem, fixed contact members in said switch casing, an endwise movable rod in said stem, contact members carried by said rod and movable therewith into and.

out et engagement with said fixed contact members, `a pivotally mounted trigger in said stem, a contractile spring :tor imparting endwise movement to said rod, means .for holding said rod. against movement. during a part ot the movement oit said ti. ger and releasing said rod at the end oi the movement ot said trigger, collars on said rod and connected with the ends ot said spring and acting against shoulders on said rod tor moving the same endwise, and means movable by said trigger tor expanding said spring for moving said rod when released,

l2. A switch handle, comprising a switch casing and a stem, ixed Contact members in said switch casing, an endwise movable rod in said stem, contact members carried by said rod and movable therewith into and out ot engagement with said lixed contact members, a pivotally mounted trigger in said stem, a contractile spring for imparting endwise movement to said rod, means tor holding said rod against n'iovcment during a part of the movement oi said trigger and releasing said rod at the end i the movement of said trigger, collars on said rod and connected with the ends of said spring and acting against shoulders on said rod for moving the same endwise, a sleeve surrounding said spring between said collars and movable by said trigger' into engagement with said collars for expanding said spring and for moving` said rod when released.

13. A. switch handle, comprising a switch casing and a stem, fixed contact members in said switch casing, an endwise movable rod in said stern, contact members carried by vsaid rod and movable therewith into and out oif engagement with said fixed Contact members, a pivotally mounted trigger in said stem, a contractile spring surroluuling said rod ior imparting endwise movement to said rod, a spring pressed pawl pivoted in said stem between the trigger and said spring and adapted to engage said rod for holding the same against endwise movement during a part of the movement of said trigger, means movable by said trigger for expanding said spring', and means operable at the end of the movement oil said trigger for withdrawing said pawl out of engagement with said rod to permit said spring to move said rod.

111. A switch handle, comprising a switch easing and a stem, fixed contact members in said switch casing, an endwise movable rod in said stem, contactmembers carried by said rod and movable therewith into and out of engagement with said fixed Contact members, a pivotally mounted trigger in said stem, a contractile spring surrounding said rod for imparting endwise movement to said rod, a spring pressed pawl pivoted in said stem between the trigger and said spring and adapted to engage said rod for holding the samev against endwise movement during a part of the movement of said trigger, and means including a bar for expanding said spring upon the movement of said trigger, and said bar Vand pawl having (5o-operative parts to withdraw the pawl from engagement with said rod at the end oi' the move-- ment of said trigger to permit said spring to move said rod.

15. A switch handle, comprising a switch casing and a stem, fixed contact members in said switch casing, an endwise movable rod in said stem, contact members carried by said rod and movable therewith into and out of engagement with said fixed contact members, a pivotally mounted trigger in said stem, a contractile spring surrounding said rod and acting thereon for imparting endwise movement to said rod, means for holding said rod against movement during a part of the movement of said trigger and releasing said rod at the end ot' the movement oit said trigger, means movable by said trigger i'for expanding said spring for moving said rod when released, and a spring for returning said trigger to its normal po sition when released.

16. A switch handle, comprising a switch casing and a stem, fixed 'contact members in said switch casing, an endwise movable rod, contact members carried by said rod and movable therewith into and out of engagement with said xed contact members, a pivoted trigger in said stem, a contractile spring surrounding said rod for imparting endwise movement to said rod, a pivoted pawl in said. stem between the trigger and said spring and adapted to engage said rod for holdingthc same against movement during a part olf the movementolf said trigger, means including a bar movable by said trigger for expanding said spring', said bar and pawl havin coacting parts to withdraw said pawl out of engagement with said rod for releasing the same at the end of the movement of said trigger to permit said spring to move said rod, and stop means for limiting the movement of said rod.

17. A switch handle, comprising a switch casing and a stem, )fixed contact members in said switch casing, a sleeve slidably mounted in said switch casing and provided with contact members movable with said sleeve into and out or" engagement with said fixed contact members, a rod secured to said sleeve and provided with oppositely facing shoulders, a contactile spring surrounding said rod, collars on said rod on opposite sides oi said shoulders and connected with said spring, a pivoted pawl in said stem and movable into and out of engagement with said rod for holding the same against movement during a part of the movement of said trigger, a sleeve surrounding said spring between said collars and movable into and out of engagement therewith, a bar connected with said second sleeve, a link connecting said bar and trigger together, said pawl and bar having icoacting inclined snr- ;taces to move said pawl out of engagement with said rod at the end oi' the movement of said trigger, and a spring connected with said trigger for returning the same to its normal position when released.

18. A switch handle, comprising a switch casing and a stem, a set of spring contact lingers in said casing, a sleeve slidably mounted in said switch casing and provided with blades with contact blocks movable with the sleeve into and out oi engagement with said lingers, an endwise movable rod secured to said sleeve and provided with oppositely facing shoulders, a contractile spring surrounding said rod, collars on said rod on opposite sides of said shoulders and movable into and out oit' contact therewith and connected with said spring, a sleeve surrounding said spring betwcen said collars if llO and movable into and out of Contact therewith, a trigger pivoted to Said stem, a Spring pressed paivl pivoted in said Stein adjacent the end ol? said rod and movable into engagement with said rod :for holding the same against movement during a part of the movement of said trigger, an endWise Inov' able har Connected With said Second sleeve, a link connecting the har and trigger together, and a Spring on the opposite Side ot Said trigger and connected therewith, Said har having earn 'faces to act on said paWl tor moving the same ont ot Contact with. said rod.

l5). A switch handle, comprising a switch easing and a stem, a switch mechanism in aid easing and having :fixed and movable Contact members, a pivoted trigger in said stem, means connecting said switch ineehanisln and trigger together for enabling the Contact members to be moved into and out of engagement with each other upon the catnation oit' the switch meenanism by said trigger, and a cable extending into Said switch easing Afrom one side thereo and having vConductor ivires connected With the respective fixed Contact members, and a Wire coil tightlj)T wound about the portion of said Cable entering Said switch easing, and holding the portion oi' said cable adjacent said casing curved direetl7 outward and away from the Same.

ln testimony that I Claim the foregoing as my invention, I aiiix my signature. this 215th da'1 oi' May, A. D. 1920.

REINHOLD A. NGK-LING. 

